Thanks a lot to BEL HR-V for writing above, I followed his guide,
I also managed to make my 2000, Honda Civic EJ9 ULEZ compliant, with D14Z2 which has a NOx of 0,045 which is less than 0.08 g/km with HC: 0.129 g/km, follow the process above which is written by BEL HR-V
1. Apply for COC in https://www.honda.co.uk/cars/owners/certificate-conformity.html( can take up to 2 weeks they send only by post so be patient)
2. Sign up in TFL website and Apply to become ULEZ
3. Upload the COC + V5 photos(all pages, can take up to 2 weeks, they send by email)
4. Ensure to mention your car is registered as compliant based on its emissions and not its euro standard rating
5. Any issues email cclondon@cclondon.com, check your spam folder for reply or call them on 0343 222 2222